Proroguing an event usually implies a pause, with the intention of resuming later. Due to the crisis, the chairperson decided to prorogue the conference.
Pro Tip 2/3
Not Cancelling
Proroguing something doesn't mean it's canceled; it's temporarily on hold. They had to prorogue the festival, but promised it would happen next year.
Pro Tip 3/3
Formal Decision
Proroguing is often a formal, official decision, not made casually. The mayor officially prorogued the town hall meeting due to weather concerns.